Specification for red and green filters used in ophthalmic dichromatic and dissociation tests Ingestion-build-50790 BS EN 50121‑3‑1:2017+A1:2019 supersedes EN

BS EN 50121‑3‑1:2017+A1:2019 supersedes EN 50121-3-1:2015

Some text has been deleted from clause 5

1 — Information about emission-related confirmed DTC(s)

1 has been corrected

BS EN 12094-3 helps in the evaluation of conformity of product by using initial type testing and factory production control method that verifies if the performance declarations represent the true behaviour of the product

Specification for red and green filters used in ophthalmic dichromatic and dissociation tests Ingestion-build-50790 BS EN 50121‑3‑1:2017+A1:2019 supersedes EN1 Scope This British Standard specifies requirements for red and green filters of glass or plastics materials used in ophthalmic tests as follows: a) dichromatic tests for ametropia, and b) dissociating the eyes in various tests of binocular co operation.